Device for measuring tensile force in rolling goods



Nov. 2, 1965 R. FLINTH 3,21

DEVICE FOR MEASURING TENSILE FORCE IN ROLLING GOODS Filed April 2, 1963 Fig-2 United States Patent DEVICE FOR MEASURING TENSILE FORCE IN ROLLING GOODS Rune Flinth, Vasteras, Sweden, assignor to Allrnanna Svenska Elektriska Aktiebolaget, Vasteras, Sweden, a corporation of Sweden Filed Apr. 2, 1963, Ser. No. 270,013 1 Claim. (Cl. 73-143) In continuous rolling of wires, etc. with the different roller pairs in straight alignment one after the other, a certain stretching of the wire between the roller pairs generally occurs. This is necessary in order for the passage of the wire between the rollers to be stable. If the stretching is insufficient the wire will be easily brought into vibration, especially at the high rolling speeds which are generally used. During the roll-ing a certain variation in temperature conditions, in cross-section of the material, hardness, etc., occurs, which causes a certain variation in reduction conditions. It is therefore necessary to use such a large tensile force in the rolling goods between the roller pairs that loose wire is not obtained at the greatest occurring variation in the one direction.

This method with stretched wire causes poorer dimension tolerance in the rolling goods, since the reduction is dependent on the tensile strength of the wire. The variation in the dimension depend on the size of the variations in the tensile force. Especially large deviations are obtained at the beginning and the end of the Wire. The deviations at the beginning are due to the fact that when the first end of the wire passes from one roller pair to the next with the help of the transfer mechanism there is no tension in the wire, and therefore this part of the wire is thicker. The same applies also to the last end of the wire Where the Wire tension disappears as soon as the end passes out of a roller pair.

It has been attempted to eliminate the above-mentioned disadvantages of the stretched wire method by letting the rolling goods run in a loop between the roller pair and letting this loop be regulated by means of different devices, e.g. photo-electric loop regulators. Such rolling mills exist for rolling goods speed up to 30 m./sec. Here also, however, certain difiiculties arise, especially with the last wire end, which has a tendency to knot itself when it leaves one roller pair. The wire end will continue straight forward but is simultaneously drawn down by mass forces in the loop. In principle it has been attempted to clear up such troublesome problems by means of diverse mechanical devices, by which a effort is made to lead the last wire end in a suitable path, for example, so-called whip screens.

The present invention intends to make it possible to lead the wire in a straight path between the roller pair and simultaneously regulate the stretching of the wire to a very low and substantially constant value. The advantage is thereby gained that the demand for good tolerance can be fulfilled, and the rolling speed can be increased to the order of 50 m./sec. or more. Since the leading device for the rolling goods between the roller pair disappears and the variations in tensile force on the rolling goods become small, the distance between the roll stands may also be decreased.

The invention is in the main characterised in that the roll stands are supported by resilient members, which are arranged at a distance from each other on a line parallel to the moving direction of the rolling goods.

3,214,970 Patented Nov. 2, 1965 Referring to the accompanying explanatory drawing:

FIGURE 1 is a side elevation of a roll stand.

FIGURE 2 shows a suitable arrangement of the measuring means.

FIGURES 3 and 4 show other arrangements of the measuring means.

FIGURE 5 shows an arrangement with the roll stand hanging in the supports.

A roll stand 1 is supported by resilient members 2. The members are preferably made of steel plates and are arranged at a distance from each other in a direct-ion parallel to the direction of movement of the rolling goods 3. The FIGURES 1, 2 and 3 refer to a non-reversing mill and the direction of movement of the rolling goods is indicated by arrow 4. A pressure sensitive measuring means 5 is arranged on one side of the roll stand. When a tensile force is created in the roll goods, the roll stand will move to the left, and this movement is approximately parallel to the direction of movement of the rolling goods because of the arrangement of the two supporting members. Owing to the fact that the supporting members consist of plates, there will be no rolling friction in the support. As will be seen from FIGURE 2, the pressure sensitive means is arranged on the same level as the rolling goods, preferably one means on each side of the rolling goods. By this arrangement the tensile force will cause no torsional moment round the measuring means. In FIGURE 3 is shown a spring 6 which presses the roll stand against the measuring means even when the tensile force is zero.

In a reversing mill measuring means are arranged on each of the sides of the roll stand as will be seen by FIGURE 4. Generally, only one of the means operates at any time, but naturally it is possible to arrange them in a pre-stressed condition. When the roll stand moves to the left the force on the left hand means increases and the force on the right hand means decreases.

Naturally it is possible to arrange the supports in such a manner that the roll stand is hanging if such arrangements will be more suitable, as will be seen in FIG- URE 5.

To avoid great movements of the roll stand there will be only a short distance between the roll stand and the pressure sensitive means.

I claim:

In a rolling mill including a plurality of roll stands through which a strip of rolling goods passes, at least two resilient members spaced apart in the direction of movement of the rolling goods supporting each of said roll stands, said stands moving in response to the tensile force of the rolling goods, pressure sensitive measuring means arranged on at least one side of each of said roll stands on the same level as said rolling goods and operably engaged by said stands when said stands are caused to move by said tensile force, said measuring means de-.

l-ivering an output signal proportional to the tensile force in the rolling goods.

References Cited by the Examiner UNITED STATES PATENTS 2,650,495 9/53 Norton 73143 2,272,984 2/42 Ritzmann 737l.2 X 2,945,379 7/60 Barnes et al 7371.2 X

RICHARD C. QUEISSER, Primary Examiner. 

